.right_nav {
    position: fixed;
    height: 100%;
    z-index: 9999;
    top: 0;
    width: 30px;
    right: 0;
    font-size: 12px;
    padding-top: 25px;
    background: #202020;
    div {
        position: relative;
        padding: 10px 0;
        text-align: center;
        background: #202020;
        &:hover {
            background-color: #f46;
            margin-top: -1px;
        }
    }
    a {
        color: #fff;
        display: block;
    }
    .nav_backtop {
        position: fixed;
        bottom: 15px;
    }
}